A CMOS-Compatible Spectrum Analyzer for Cognitive Radio Exploiting Crosscorrelation to Improve Linearity and Noise Performance

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    Abstract

    Abstract—A spectrum analyzer requires a high linearity to handle strong signals, and at the same time a low NF to enable detection of much weaker signals. This is not only important for lab equipment, but also for the spectrum sensing part of cognitive radio, where low cost and integration is at a premium. Often there is a trade-off between linearity and noise: improving one degrades the other. Crosscorrelation can break this tradeoff by reducing noise at the expense of measurement time. An existing RF frontend in CMOS-technology with IIP3=+11dBm and NF=5.5 dB is duplicated and attenuators are put in front to increase linearity to IIP3=+24 dBm. The attenuation degrades NF, but by using crosscorrelation of the outputs of the two frontends, the effective NF is reduced to around 5 dB. In total, this results in a spurious-free dynamic range of 88 dB in 1MHz resolution bandwidth.
    Original languageEnglish
    Pages (from-to)479-492
    Number of pages14
    JournalIEEE transactions on circuits and systems I: regular papers
    Volume59
    Issue number3
    DOIs
    Publication statusPublished - Mar 2012

    Fingerprint

    Spectrum analyzers
    Cognitive radio
    Time measurement
    Bandwidth
    Costs

    Keywords

    • EWI-20456
    • IR-79000
    • METIS-281529

    Cite this

    @article{72ecdcb308b0445f84e52db2a3c17523,
    title = "A CMOS-Compatible Spectrum Analyzer for Cognitive Radio Exploiting Crosscorrelation to Improve Linearity and Noise Performance",
    abstract = "Abstract—A spectrum analyzer requires a high linearity to handle strong signals, and at the same time a low NF to enable detection of much weaker signals. This is not only important for lab equipment, but also for the spectrum sensing part of cognitive radio, where low cost and integration is at a premium. Often there is a trade-off between linearity and noise: improving one degrades the other. Crosscorrelation can break this tradeoff by reducing noise at the expense of measurement time. An existing RF frontend in CMOS-technology with IIP3=+11dBm and NF=5.5 dB is duplicated and attenuators are put in front to increase linearity to IIP3=+24 dBm. The attenuation degrades NF, but by using crosscorrelation of the outputs of the two frontends, the effective NF is reduced to around 5 dB. In total, this results in a spurious-free dynamic range of 88 dB in 1MHz resolution bandwidth.",
    keywords = "EWI-20456, IR-79000, METIS-281529",
    author = "{Oude Alink}, M.S. and Klumperink, {Eric A.M.} and Kokkeler, {Andre B.J.} and M.C.M. Soer and Smit, {Gerardus Johannes Maria} and Bram Nauta",
    year = "2012",
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    doi = "10.1109/TCSI.2011.2167266",
    language = "English",
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    journal = "IEEE transactions on circuits and systems I: regular papers",
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    T1 - A CMOS-Compatible Spectrum Analyzer for Cognitive Radio Exploiting Crosscorrelation to Improve Linearity and Noise Performance

    AU - Oude Alink, M.S.

    AU - Klumperink, Eric A.M.

    AU - Kokkeler, Andre B.J.

    AU - Soer, M.C.M.

    AU - Smit, Gerardus Johannes Maria

    AU - Nauta, Bram

    PY - 2012/3

    Y1 - 2012/3

    N2 - Abstract—A spectrum analyzer requires a high linearity to handle strong signals, and at the same time a low NF to enable detection of much weaker signals. This is not only important for lab equipment, but also for the spectrum sensing part of cognitive radio, where low cost and integration is at a premium. Often there is a trade-off between linearity and noise: improving one degrades the other. Crosscorrelation can break this tradeoff by reducing noise at the expense of measurement time. An existing RF frontend in CMOS-technology with IIP3=+11dBm and NF=5.5 dB is duplicated and attenuators are put in front to increase linearity to IIP3=+24 dBm. The attenuation degrades NF, but by using crosscorrelation of the outputs of the two frontends, the effective NF is reduced to around 5 dB. In total, this results in a spurious-free dynamic range of 88 dB in 1MHz resolution bandwidth.

    AB - Abstract—A spectrum analyzer requires a high linearity to handle strong signals, and at the same time a low NF to enable detection of much weaker signals. This is not only important for lab equipment, but also for the spectrum sensing part of cognitive radio, where low cost and integration is at a premium. Often there is a trade-off between linearity and noise: improving one degrades the other. Crosscorrelation can break this tradeoff by reducing noise at the expense of measurement time. An existing RF frontend in CMOS-technology with IIP3=+11dBm and NF=5.5 dB is duplicated and attenuators are put in front to increase linearity to IIP3=+24 dBm. The attenuation degrades NF, but by using crosscorrelation of the outputs of the two frontends, the effective NF is reduced to around 5 dB. In total, this results in a spurious-free dynamic range of 88 dB in 1MHz resolution bandwidth.

    KW - EWI-20456

    KW - IR-79000

    KW - METIS-281529

    U2 - 10.1109/TCSI.2011.2167266

    DO - 10.1109/TCSI.2011.2167266

    M3 - Article

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    EP - 492

    JO - IEEE transactions on circuits and systems I: regular papers

    JF - IEEE transactions on circuits and systems I: regular papers

    SN - 1549-8328

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    ER -